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<?php |
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/** |
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* Copyright (C) 2009-2019 Graham Breach |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/** |
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* For more information, please contact <graham@goat1000.com> |
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*/ |
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|
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namespace Goat1000\SVGGraph; |
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|
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/** |
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* Axis with fixed measurements |
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*/ |
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class AxisFixed extends Axis { |
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|
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protected $step; |
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protected $orig_max_value; |
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protected $orig_min_value; |
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|
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public function __construct($length, $max_val, $min_val, $step, |
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$units_before, $units_after, $decimal_digits, $label_callback, $values) |
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{ |
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// min_unit = 1, min_space = 1, fit = false |
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parent::__construct($length, $max_val, $min_val, 1, 1, false, $units_before, |
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$units_after, $decimal_digits, $label_callback, $values); |
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$this->orig_max_value = $max_val; |
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$this->orig_min_value = $min_val; |
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$this->step = $step; |
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} |
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|
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/** |
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* Calculates a grid based on min, max and step |
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* min and max will be adjusted to fit step |
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*/ |
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protected function grid() |
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{ |
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// use the original min/max to prevent compounding of floating-point |
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// rounding problems |
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$min = $this->orig_min_value; |
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$max = $this->orig_max_value; |
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|
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// if min and max are the same side of 0, only adjust one of them |
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if($max * $min >= 0) { |
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$count = $max - $min; |
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if(abs($max) >= abs($min)) { |
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$this->max_value = $min + $this->step * ceil($count / $this->step); |
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} else { |
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$this->min_value = $max - $this->step * ceil($count / $this->step); |
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} |
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} else { |
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$this->max_value = $this->step * ceil($max / $this->step); |
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$this->min_value = $this->step * floor($min / $this->step); |
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} |
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|
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$count = ($this->max_value - $this->min_value) / $this->step; |
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$ulen = $this->max_value - $this->min_value; |
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if($ulen == 0) |
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throw new \Exception('Zero length axis (min >= max)'); |
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$this->unit_size = $this->length / $ulen; |
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$grid = $this->length / $count; |
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$this->zero = (-$this->min_value / $this->step) * $grid; |
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return $grid; |
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} |
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|
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/** |
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* Sets the bar style, adding an extra unit |
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*/ |
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public function bar() |
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{ |
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if(!$this->rounded_up) { |
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$this->orig_max_value += $this->min_unit; |
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parent::bar(); |
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} |
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} |
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} |
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|
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